Section 508 Compliance for Documents

Section 508 of the Rehabilitation Act requires federal agencies and their partners to make electronic content accessible to people with disabilities. For PDF documents, that means proper tagging, reading order, alt text, and structural markup — and CASO Comply automates the entire process.

Free Compliance Scan Talk to an Expert

What Section 508 Requires for Documents

The 2017 Section 508 Refresh aligned federal accessibility standards with WCAG 2.0 Level AA. For PDF documents, this translates into specific technical requirements.

Tagged PDF Structure

Every PDF must contain a logical tag tree that identifies headings, paragraphs, lists, tables, and other structural elements so assistive technologies can interpret the content.

Reading Order

Content must be presented in a meaningful reading sequence. Screen readers follow the tag order, not the visual layout — so the underlying structure must match the intended reading flow.

Alternative Text

All non-decorative images, charts, graphs, and diagrams must include descriptive alternative text that conveys the same information to users who cannot see the visual content.

Table Markup

Data tables must have properly marked row and column headers. Complex tables with merged cells or multi-level headers require explicit header-cell associations.

Form Accessibility

Interactive form fields must have associated labels, logical tab order, and clear instructions. Required fields and validation errors must be programmatically conveyed.

Color & Contrast

Text must meet minimum contrast ratios (4.5:1 for normal text, 3:1 for large text). Information cannot be conveyed by color alone — patterns or labels must supplement color cues.

Document Language

The primary language of the document must be specified in the metadata so screen readers apply the correct pronunciation rules. Language changes within the document must also be marked.

Bookmarks & Navigation

Documents longer than a few pages must include bookmarks that mirror the heading structure, allowing users to navigate directly to specific sections without scrolling.

Who Needs Section 508 Compliance?

Section 508 applies to more organizations than many realize. If your organization touches federal systems or funding, you likely have compliance obligations.

Federal Agencies

All U.S. federal agencies must ensure their electronic and information technology — including PDF documents — is accessible to employees and members of the public with disabilities.

Federal Contractors

Any organization that sells products or services to the federal government must meet Section 508 standards. Non-compliance can disqualify you from federal procurement.

Grant Recipients

Organizations that receive federal funding — including state agencies, universities, nonprofits, and research institutions — are often required to comply with Section 508 as a condition of their grant.

State & Local Government

Many state governments have adopted Section 508 as their own accessibility standard, extending the same requirements to state agencies and their vendors.

How CASO Comply Achieves 508 Compliance

Our platform combines AI-powered automation with industry-standard validation to deliver fast, reliable Section 508 compliance at scale.

Automated Remediation

Our AI engine analyzes each document, builds a compliant tag structure, sets reading order, generates alt text, and marks up tables — all without manual intervention. Most documents are fully remediated in under a minute.

VPAT Generation Support

We provide detailed compliance reports that map directly to VPAT (Voluntary Product Accessibility Template) criteria, making it straightforward to document your 508 conformance for procurement officers.

Compliance Certificates

Each remediated document can be accompanied by a Certificate of Compliance that attests to its conformance with Section 508 standards — documentation you can present during audits or procurement reviews.

veraPDF Validation

Every output document is validated against the PDF/UA standard using veraPDF, the industry-standard open-source validator. You receive a machine-verified guarantee, not just a promise.

Section 508 vs. ADA Title II

Both laws require accessible documents, but they apply to different organizations with different enforcement mechanisms. Many government entities must comply with both.

Aspect	Section 508	ADA Title II
Who it applies to	Federal agencies, federal contractors, and organizations receiving federal funding.	State and local government entities, regardless of federal funding.
Legal basis	Section 508 of the Rehabilitation Act of 1973, as amended in 2017.	Title II of the Americans with Disabilities Act of 1990, with 2024 rulemaking update.
Technical standard	Incorporates WCAG 2.0 Level AA by reference (with the 2017 Refresh).	References WCAG 2.1 Level AA under the 2024 DOJ final rule.
Scope	Electronic and information technology: documents, software, websites, hardware, and telecommunications.	Web content and mobile applications of state and local government entities.
Enforcement	Complaints to the agency, administrative remedies, or lawsuits under the Rehabilitation Act.	DOJ enforcement actions, private lawsuits, and compliance reviews.
Deadlines	Ongoing obligation — no phase-in period. Agencies must comply now.	Population ≥50K: April 24, 2026. Population <50K: April 26, 2027.

How Section 508 Relates to WCAG 2.1 AA

The 2017 Refresh

The 2017 Section 508 Refresh eliminated the previous set of technology-specific requirements and replaced them with a direct incorporation of WCAG 2.0 Level AA. This means that if your documents meet WCAG 2.0 AA, they satisfy the technical requirements of Section 508.

Why We Target WCAG 2.1 AA

WCAG 2.1 is a superset of WCAG 2.0 — every WCAG 2.0 criterion is included in 2.1. By remediating to the newer 2.1 AA standard, CASO Comply ensures your documents exceed Section 508 requirements while also satisfying ADA Title II, EN 301 549 (European standard), and other frameworks that reference WCAG 2.1. One remediation pass covers all your compliance obligations.

PDF/UA and Section 508

PDF/UA (ISO 14289) is the international standard specifically for accessible PDFs. While Section 508 does not explicitly require PDF/UA conformance, meeting PDF/UA is the most reliable way to demonstrate that a PDF satisfies the WCAG success criteria referenced by Section 508. CASO Comply validates every output document against PDF/UA using the veraPDF validator.

Start your path to Section 508 compliance

Run a free scan to identify accessibility issues across your document library, or talk to our team about a remediation plan tailored to your agency or organization.

Free Compliance Scan Contact Sales